A recurring error

[SolarBear]

Hi.

Slowly (VERY slowly, in fact) continuing my trip in the world of Lisp, I've got that error more than once when defining functions :
(PUSH (CAR LST2) LST1) should be a lambda expression

What does that mean, exactly ? If I define lst1 and lst2 first and try (push (car lst2) lst1), I get the correct output. I know what's a lambda expression but I don't see why it applies here.

[jemfinch]

It's just an odd error due to the macro expansion of push -- remember, push isn't a function, but a macro.

Jeremy

[stuka]

Heh - interesting to note that C isn't the only language where macro expansion can bite you on the butt ;) </snide_remark>

[SolarBear]

Originally posted by jemfinch
It's just an odd error due to the macro expansion of push -- remember, push isn't a function, but a macro.

Jeremy

Ah ok, thanks a lot. I'm still struggling with functions vs. macros, when to use one instead of the other, etc. But I'll get it sorted. :thumb: